1 ► Alabama, Jackson County, Woodville — Cathedral Caverns —

Cathedral Caverns has been designated a Registered Natural Landmark under the provisions of the Historic Sites Act of August 21, 1935 This site possesses exceptional value in illustrating the natural history of the . . . — — Map (db m76233) HM

2 ► Arizona, Coconino County, Jacob Lake — Kaibab Squirrel Area —

Has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation's natural heritage and contributes to a better understanding of the environment. — — Map (db m94912)

3 ► Arkansas, Fulton County, Mammoth Spring — Mammoth Spring — National Natural Landmark —

Mammoth Spring has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation's natural heritage and contributes to a better understanding of man’s environment 1990 National Park . . . — — Map (db m192000) HM

4 ► California, San Bernardino County, Amboy — 92 — Amboy Crater — National Natural Landmark —

Amboy Crater, formed of ash and cinders, is 250 feet high and 1500 feet in diameter. The crater is in one of the youngest volcanic fields in the United States. Six distinct periods of eruptions created the resulting nested group of volcanic cinder . . . — — Map (db m78561) HM

5 ► California, San Bernardino County, Trona — Welcome to the Trona Pinnacles — ... a National Natural Landmark —

Rising from the bottom of what was once an ancient lakebed, the Trona Pinnacles represent one of the most unique geologic landscapes in the California Desert. Over 500 of these tufa or calcium carbonate spires are spread out over a 14 square mile . . . — — Map (db m50221) HM

6 ► California, Shasta County, Burney — Burney Falls —

Burney Falls has been dedicated a National Natural Landmark. This site possesses exceptional value as an illustration of the nation's natural heritage and contributes to a better understanding of man's environment. — — Map (db m546) HM

7 ► California, Siskiyou County, Mt. Shasta — Mount Shasta —

Administered by the Forest Service, United States Department of Agriculture has been designated a Registered Natural Landmark This site possesses exceptional value as an illustration of the nation's natural heritage and contributes to a . . . — — Map (db m89118) HM

8 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — A Priceless Gift — Garden of the Gods Park —

In 1879, General William Jackson Palmer, founder of Colorado Springs, convinced his friend Charles Elliot Perkins to purchase land in Garden of the Gods. Perkins eventually bought a total of 480 spectacular acres surrounding the Gateway Rocks, . . . — — Map (db m135646) HM

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9 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — Garden of the Gods Park —

The beauty of Garden of the Gods Park, with its dramatic red rock formations framing Pikes Peak, serves as a magnificent eastern gateway to Colorado’s Rocky Mountains. The park’s towering red sandstone rocks have long been recognized as a landmark. . . . — — Map (db m45983) HM

10 ► Colorado, El Paso County, Colorado Springs, West Colorado Springs — Time Frozen In Stone — Garden of the Gods Park —

This rock formation, called Sentinel Rock, is a geologic treasure. It is composed of two types of rock - a fine sandstone and a gravelly conglomerate. The various layers in this rock were deposited 275 million years ago. During that time, ancient . . . — — Map (db m135022) HM

11 ► Colorado, Jefferson County, Morrison — Morrison Fossil Area — National Natural Landmark —

Morrison Fossil Area has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation's natural heritage and contributes to a better understanding of the environment 1973 National . . . — — Map (db m155600) HM

12 ► Florida, Alachua County, Gainesville — Devil's Millhopper — Registered Natural Landmark —

Devil’s Millhopper has been designated a Registered Natural Landmark This site possesses exceptional value as an illustration of the Nation’s natural heritage and contributes to a better understanding of man’s environment . . . — — Map (db m125200) HM

13 ► Florida, Collier County, Naples — What Makes Corkscrew Swamp Special? — National Natural Landmark —

Bald cypress, the swamp and wood storks make this National Audubon Society sanctuary unique. The source of storks Wood storks come to Corkscrew Swamp during the dry months of winter and early spring. Here, in greater numbers than anywhere . . . — — Map (db m164800) HM

14 ► Florida, Wakulla County, Wakulla Springs — F-394 — Wakulla Springs Archaeological & Historic District —

This location is significant as it represents relationships between human culture and natural resources from the settlement systems of the Paleoindian period to the recent historic past, a period of nearly 15,000 years. There are 55 recorded . . . — — Map (db m101862) HM

15 ► Idaho, Cassia County, Oakley — 344 — City of Rocks —

A vast display of towering granite rocks (16 miles southeast of here) attracted emigrants who were on their way to California. A gold rush visitor, July 14, 1849, reported that "you can imagine among these massive piles, church domes, spires, . . . — — Map (db m31637) HM

16 ► Indiana, Crawford County, Marengo — Marengo Cave National Landmark —

Discovered September 6, 1883 by Blanche & Orris Hiestand who descended into the first room. The following Sunday, Mitch Stewart and friends explored the main passageways. The next day, local residents descended in mass on the cave. Owner Samuel . . . — — Map (db m70554) HM

17 ► Indiana, Fountain County, Covington — Portland Arch Natural Preserve —

has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the nation's natural heritage and contributes to a better understanding of the environment — — Map (db m10093) HM

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18 ► Indiana, Porter County, Dune Acres — Dune Creek Watershed: What Makes It Special? —

Over 11 square miles of marshes, savannas, oak forests, and other landscapes drain into Lake Michigan at this point. You are standing in the Dunes Creek watershed which drains into Lake Michigan and encompasses all of the Indiana Dunes . . . — — Map (db m161460) HM

19 ► Indiana, Wabash County, Lagro — Hanging Rock — National Natural Landmark —

The Legend of Hanging Rock Wy-nu-sa was a beautiful Miami Indian maiden who thought she was in love with two handsome, strong, stalwart Indian braves. Both of the young men were deeply in love with the maiden, too, but she was not able . . . — — Map (db m71305) HM

20 ► Kansas, Ottawa County, Minneapolis — Welcome to Rock City —

Rock City rocks are magnificent examples of sandstone concretions which have formed in the millions of years since Kansas was covered by an inland sea. This is the only place in the world where so many concretions of such giant size are found in . . . — — Map (db m79957) HM

21 ► Missouri, Oregon County, Koshkonong — Grand Gulf —

Grand Gulf has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation's natural heritage and contributes to a better understanding of man’s environment . . . — — Map (db m207737) HM

22 ► Missouri, Stone County, Branson — Marvel Cave —

Marvel Cave has been designated a Registered Natural Landmark under the provisions of the Historic Sites Act of August 21, 1935. This site possesses exceptional value in illustrating the natural history of the United States US. . . . — — Map (db m209709) HM

23 ► Nebraska, Grant County, Hyannis — Nebraska Sand Hills — National Natural Landmark —

Nebraska Sand Hills has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation's natural heritage and contributes to a better understanding of Man’s environment . . . — — Map (db m178499) HM

24 ► Nevada, Clark County, Overton — Valley of Fire —

has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation's Natural heritage and contributes to a better understanding of the environment. 1968 National Park Service . . . — — Map (db m3433) HM

25 ► New Jersey, Somerset County, Franklin Twp — William L. Hutcheson Memorial Forest — National Natural Landmark —

William L. Hutcheson Memorial Forest has been designated a National Natural Landmark. This site possesses exceptional value as an illustration of the nation's natural heritage and contributes to a better understanding of the environment. 1976. . . . — — Map (db m99139) HM

26 ► New York, Albany County, Albany — National Natural Landmark —

In 2014, the Albany Pine Bush was designated a National Natural Landmark by the U.S. Department of the Interior in recognition of outstanding geological and biological features including the largest area of inland sand dunes in the eastern . . . — — Map (db m191105) HM

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27 ► New York, Monroe County, Fairport — Hart's Woods —

Has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the nation's natural heritage and contributes to a better understanding of the environment — — Map (db m57738) HM

28 ► Ohio, Ashland County, Loudonville — 6-3 — Clear Fork Gorge — A Feature of Ohio's Forests —

Clear Fork Gorge was formed when glacial meltwater cut through the sandstone bedrock that forms its steep walls fourteen to twenty-four thousand years ago. The gorge is one thousand feet wide and over three hundred feet deep. Its seclusion has . . . — — Map (db m24285) HM

29 ► Ohio, Champaign County, Urbana — Cedar Bog —

Cedar Bog… • is a nature preserve with several different wetlands. • has a mile-plus long boardwalk providing a pathway through the wetlands that is easy, dry, and handicapped-accessible. • is a paradise for naturalists and . . . — — Map (db m198691) HM

30 ► Ohio, Champaign County, Urbana — 6-11 — Cedar Bog Nature Preserve —

In 1942 Cedar Bog became the first nature preserve in Ohio purchased with state funds. Efforts to set this wetland aside began in the 1920s through the efforts of Florence Murdock and her daughter. Efforts intensified in the mid 1930s with help . . . — — Map (db m90503)

31 ► Ohio, Cuyahoga County, Walton Hills, Sagamore Hills Township — Tinker's Creek is Gorgeous — Cleveland Metroparks —

Tinker's Creek is named after Joseph Tinker, a member of Moses Cleveland's survey crew. The creek has been carving this gorge from the surrounding rock for thousands of years. The creek begins its 28.2 mile journey in Portage County, flows . . . — — Map (db m228171) HM

32 ► Ohio, Fulton County, Archbold — Goll Woods — 100 Acres of Virginia Timber —

A living memorial to the Goll Family whose love of trees preserved this natural sanctuary through five generations. The forest is part of a 320-acre farm purchased in 1837 from the U.S. Government by Peter Goll, Sr. and sold in 1966 to the state . . . — — Map (db m172010) HM

33 ► Ohio, Greene County, Clifton — Clifton Gorge Marker — The Old Trail Head — The Obscure Marker —

Clifton Gorge has been designed a Registered Natural Landmark under the provisions of the Historic Sites Act of August 21, 1935 this site possesses exceptional value in illustrating the natural history of the United States U. S. Department . . . — — Map (db m77111) HM

34 ► Oregon, Lake County, Fort Rock — Fort Rock State Park —

Ten thousand years ago, Fort Rock was prime real estate for cave-dwelling families. Food was plentiful and there was a great lake where you stand. Walk the trail of this giant "tuff ring" and you'll discover dynamic strands of nature woven . . . — — Map (db m113569) HM

35 ► Pennsylvania, Berks County, Kempton, Albany Township — Hawk Mountain Sanctuary —

Founded in 1934 by Rosalie Edge, it is the world's first refuge for birds of prey. It had been a popular shooting site because of its location on a major hawk migration corridor and a 1929 bounty placed on northern goshawks. Through the work of its . . . — — Map (db m140170) HM

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36 ► Pennsylvania, Carbon County, White Haven — Hickory Run Boulder Field — Hickory Run State Park —

. . . — — Map (db m28657) HM

37 ► Pennsylvania, Erie County, Erie, Millcreek Township — Presque Isle —

Presque Isle has been designated a Registered Natural Landmark under the provisions of the Historic Sites Act of August 21, 1933 This site possesses exceptional value in illustrating the natural history of the United . . . — — Map (db m132341) HM

38 ► Pennsylvania, Fayette County, Connellsville — Connellsville — Trail Map and Points of Interest —

Cedar Creek Gorge, 21.8 miles north. Off the main trail in Cedar Creek Park, you will find waterfalls and wildflowers, as well as a suspension bridge over the gorge. photo by Betsy Mandarino.Great Tufa Formation, 20.5 miles north. A living, . . . — — Map (db m76710) HM

39 ► Pennsylvania, Lycoming County, Jersey Shore, Watson Township — Glacier to Gorge — An Incredible Diversion — Pine Creek Rail Trail —

A half-million years ago, North America entered one of several "ice ages." Thousands of years of relentless cold passed, and ice accumulated a mile thick across Canada. The ice eventually formed glaciers that slowly advanced southward into . . . — — Map (db m216285) HM

40 ► Pennsylvania, Philadelphia County, Philadelphia, Center City — Wissahickon Valley — 1868 — Parkway Museums District —

The inspiration for this garden is the Wissahickon Valley Park, a picturesque wooded gorge extending seven miles along Wissahickon Creek in the northwestern section of Philadelphia. The first to walk the rugged trails of the valley were the . . . — — Map (db m212730) HM

41 ► Pennsylvania, Philadelphia County, Philadelphia, Northwest Philadelphia — Forbidden Drive — 1869 —

Welcome to Wissahickon Valley Park and Forbidden DriveMany rough mill roads once ran through this valley. But as traffic increased, people needed a better road. In the early 1850s, work began on a turnpike to ease travel between the mills and . . . — — Map (db m69097) HM

42 ► Pennsylvania, Philadelphia County, Philadelphia, Northwest Philadelphia — Park Directory — Wissahickon Valley Park —

Welcome to Wissahickon Valley Park! Designated a National Natural Landmark in 1964, the Wissahickon Creek gorge is one of the most unique places in the City of Philadelphia. Carved through the distinctive Wissahickon Schist bedrock, . . . — — Map (db m160457) HM

43 ► Pennsylvania, Philadelphia County, Philadelphia, Roxborough — Park Directory — Wissahickon Valley Park —

Welcome to Wissahickon Valley Park! Designated a National Natural Landmark in 1964, the Wissahickon Creek gorge is one of the most unique places in the City of Philadelphia. Carved through the distinctive Wissahickon Schist bedrock, . . . — — Map (db m232064) HM

44 ► Pennsylvania, Tioga County, Shippen Township — Pine Creek — Grand Canyon of Pennsylvania —

The Indians called Pine Creek “Tiadaghton,” which meant river of pines. These now-gone pines brought drastic changes to Pine Creek. Logging began in the 1800s. Before the logging, the thick soil held rainwater like a sponge. It released it . . . — — Map (db m93076) HM

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45 ► Pennsylvania, Wayne County, Lake Ariel — Lake Lacawac —

Lake Lacawac has been classified a Registered National Landmark under the provisions of the Historic Sites Act of August 21, 1935 This site possesses exceptional value in illustrating the natural history of the United States U.S. . . . — — Map (db m144861) HM

46 ► South Dakota, Fall River County, Hot Springs — 680 — Mammoth Site of Hot Springs, SD —

Gigantic Mammoths, ancestors of the elephants of today, once roamed freely across the High Plains of North America. A repository of their remains, along with other prehistoric animals, lay undisturbed until their discovery over 26,000 years later, . . . — — Map (db m184458) HM

47 ► South Dakota, Harding County, Reva — The Castles —

The Castles Administered by the Forest Service United States Department of Agriculture has been designated a Registered Natural Landmark This site possesses exceptional value as an . . . — — Map (db m154916) HM

48 ► South Dakota, Roberts County, Browns Valley — 547 — Ancient River Warren Channel —

has been designated a Registered Natural Landmark Under the provisions of the Historic Sites Act of August 21, 1935 this site possesses exceptional value in illustrating the natural history of the United States U. S. Department of . . . — — Map (db m185215) HM

49 ► South Dakota, Roberts County, Sisseton — Sieche Hollow —

Has been designated a Registered Natural Landmark Under the Provisions of the Historic Sites Act of August 21, 1955 This site Possesses Exceptional Value In illustrating the Natural History of the United States U.S. . . . — — Map (db m123355) HM

50 ► Vermont, Lamoille County, Stowe — Mount Mansfield Natural Area — National Natural Landmark —

Mount Mansfield Natural Area has been designated a National Natural Landmark This site possesses exceptional value as an illustration of the Nation’s natural heritage and contributes to a better understanding of man’s environment. 1980 . . . — — Map (db m160995) HM

51 ► Virginia, Page County, Luray — Luray Caverns —

(front) Near This Spot Andrew Campbell, feeling the cool air of newly found natural wonder Luray Caverns, is shown here very shortly after this "discovery of the century" was made. Photo was most likely taken by co-discoverer Benton . . . — — Map (db m106463) HM

52 ► Virginia, Page County, Luray — The Beautiful Caverns of Luray — Welcome to Luray Caverns —

The Discovery of the Century On August 13, 1878, town tinsmith Andrew Campbell, Campbell's 13-year-old nephew Quint, and three other men were exploring for a cave. With the help of a companion, photographer Benton Stebbins, they dug away . . . — — Map (db m159107) HM

53 ► Washington, Whitman County, Steptoe — 31 — Steptoe Butte — The Evergreen State —

This butte was first called Pyramid Peak. It was named “Steptoe” for a commander in the Indian wars at a battle in 1858 near the present town of Rosalia. In the 1880s James S. Davis built a resort and observatory on the Butte’s top. A . . . — — Map (db m129095) HM

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54 ► West Virginia, Greenbrier County, Caldwell — Confederate Saltpeter Works — Civil War Industrial Center —

Although saltpeter (potassium nitrate or nitre), an essential element in the manufacture of gunpowder, had been mined at Organ Cave since the eighteenth century, the need for the mineral increased dramatically during the Civil War. Several saltpeter . . . — — Map (db m59342) HM